ProductToWebsiteChangeObserver.php

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<?php
namespace Magento\CatalogUrlRewrite\Observer;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\Product\Visibility;
use Magento\CatalogUrlRewrite\Model\ProductUrlRewriteGenerator;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Event\ObserverInterface;
use Magento\Store\Model\Store;
use Magento\UrlRewrite\Model\UrlPersistInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;

class ProductToWebsiteChangeObserver implements ObserverInterface
{
    protected $productUrlRewriteGenerator;

    protected $urlPersist;

    protected $productRepository;

    protected $request;

    public function __construct(
        ProductUrlRewriteGenerator $productUrlRewriteGenerator,
        UrlPersistInterface $urlPersist,
        ProductRepositoryInterface $productRepository,
        RequestInterface $request
    ) {
        $this->productUrlRewriteGenerator = $productUrlRewriteGenerator;
        $this->urlPersist = $urlPersist;
        $this->productRepository = $productRepository;
        $this->request = $request;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        foreach ($observer->getEvent()->getProducts() as $productId) {
            $product = $this->productRepository->getById(
                $productId,
                false,
                $this->request->getParam('store_id', Store::DEFAULT_STORE_ID)
            );

            $this->urlPersist->deleteByData([
                UrlRewrite::ENTITY_ID => $product->getId(),
                UrlRewrite::ENTITY_TYPE => ProductUrlRewriteGenerator::ENTITY_TYPE,
            ]);
            if ($product->getVisibility() != Visibility::VISIBILITY_NOT_VISIBLE) {
                $this->urlPersist->replace($this->productUrlRewriteGenerator->generate($product));
            }
        }
    }
}